Calculating Vapor Composition from known liquid composition

[chebags05]

Need some help extracting this from my brain. I need to calculate the vapor composition of 60%isopropanol/water mixture at atmospheric pressure and 160 F (for scrubber emissions estimate). Tried running a flash in aspen but nothing flashes. I feel like this should be easy to calculate by hand but can't find a great example in my thermo book.

 

[Latexman]

Check your old mass transfer text from college, not thermo.

Good luck,
Latexman

Technically, the glass is always full - 1/2 air and 1/2 water.

 

[chebags05]

After reading up again I think you just use Antoine's to get the vapor pressure of both, then use Rault's to get the partial pressure and thus, the mole fraction.

 

[StoneCold]

chebags05
You are on the right track. Then once you have the mole fraction multiply that by the air flow to get your emissions.

Regards
StoneCold